Neptunes, exoplanets whose sizes are between Earth and Neptune, and which are between the known for their water-rich ...

Neptune is big, it’s blue, and it is a planet that can tear you apart if you happen to drop into one of its massive, ...

For astrobiologists, the search for life beyond our solar system could be likened to where one would look in a vast ...

Planet Nine was previously suggested as a possible explanation for distant orbital clustering. It was thought to be ten times Earth’s mass, orbiting far beyond Neptune.

Recent research suggests a warp in the orbital plane of Trans-Neptunian Objects (TNOs) between 80 and 400 AU, hinting at the ...

On August 24, 2006, Pluto ceased to be considered a planet. A mixture of rock and ice located in the Kuiper Belt, a region of icy objects beyond the orbit of Neptune. This demotion ...

Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper ...

A study suggests an Earth-sized planet, dubbed Planet Y, may exist beyond Neptune, affecting the orbits of icy objects in the ...

A Planet Parade describes the rare celestial event when multiple planets align in the same region of the sky as seen from ...

A new study suggests the existence of Planet Y. This hidden planet may be affecting the Kuiper Belt. The gravity of Planet Y ...

Independent previous research has also proposed a similar Planet Y to explain the warp or other features in the TNO population. The good news is that the existence of this planet might be confirmed or ...

Today in the history of astronomy, NASA announces our first view of the rings of Neptune.